US Bridges

HWY 147 over Small Natural Stream

Poor

Floyd County, Iowa · 095181303 · Structure no. 000000000025060

Built
1967
58 years old
Condition
Poor
inspected March 2024
Type
Slab
Concrete Continuous
Length
92 ft
3 main spans
Daily traffic
1,070
2022 count
Owner
County
County Highway Agency

About this bridge

HWY 147 over Small Natural Stream is a concrete continuous slab carrying HWY 147 over Small Natural Stream in Floyd County, Iowa. It was built in 1967, so it is 58 years old, older than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 1,070 vehicles a day, roughly 11% of them trucks, projected to reach 1,070 by 2044. The structure is 92 ft (28 m) long and 36 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

Location

Open in Google Maps
CarriesHWY 147
CrossesSmall Natural Stream
Location095181303
RouteCounty Highway 0
CountyFloyd County
StateIowa
Coordinates43.05211, -92.91822
Functional classRural Major Collector

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating56.7 US tons
Inventory rating34 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length92 ft (28 m)
Longest span35 ft (10.7 m)
Deck width36 ft (11 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,070 (2022)
Projected traffic1,070 by 2044
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.7 mi (14 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1.3 million (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was HWY 147 over Small Natural Stream built?

It was built in 1967, making it 58 years old in 2025.

What condition is HWY 147 over Small Natural Stream in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in March 2024.

How much traffic does HWY 147 over Small Natural Stream carry?

About 1,070 vehicles per day (2022 count), of which roughly 11% are trucks.

How long is HWY 147 over Small Natural Stream?

The structure is 92 ft (28 m) long with a longest span of 35 ft (10.7 m) and a deck 36 ft wide.

Who owns HWY 147 over Small Natural Stream?

It is owned by the County Highway Agency.